Beryl
Sherriff B L, Grundy H D, Hartman J S, Hawthorne F C, Cerny P
The Canadian Mineralogist 29 (1991) 271-285
The incorporation of alkalis in beryl: multi-nuclear MAS NMR
and crystal-structure study
Sample: T-24
Locality: Bernic Lake, Manitoba, Canada
_database_code_amcsd 0005261
9.228 9.228 9.240 90 90 120 P6/mcc
atom     x     y     z occ  Uiso
Si   .3893 .1192     0     .0070
Be     1/2     0   1/4 .85 .0122
Li     1/2     0   1/4 .15 .0122
Al     2/3   1/3   1/4     .0054
O1   .3043 .2349     0     .0147
O2   .4985 .1477 .1466     .0145
Na       0     0     0 .28 .0251
Li       0     0     0 .01 .0251
Cs       0     0   1/4 .15 .0389